Well, it's been a morning. I've uninstalled, reinstalled, rinse and repeat. It tells me it's already installed but it's not in the drop-down.
I decided to check the files to see what's going on. It shows up in the Sims 3 download folder with the green icon which allows me to launch directly. When I do that it's still not in the drop-down menu.
It wasn't showing up in install worlds so I moved that file over from the SD card I have it saved on. That didn't work either. So I have to play with it some more and hopefully getting it working again.